2489891 has 2 divisors, whose sum is σ = 2489892. Its totient is φ = 2489890.

The previous prime is 2489881. The next prime is 2489909. The reversal of 2489891 is 1989842.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2489891 - 2¹⁸ = 2227747 is a prime.

It is not a weakly prime, because it can be changed into another prime (2489801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1244945 + 1244946.

It is an arithmetic number, because the mean of its divisors is an integer number (1244946).

2^2489891 is an apocalyptic number.

2489891 is a deficient number, since it is larger than the sum of its proper divisors (1).

2489891 is an equidigital number, since it uses as much as digits as its factorization.

2489891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 41.

The square root of 2489891 is about 1577.9388454563. The cubic root of 2489891 is about 135.5377000529.

The spelling of 2489891 in words is "two million, four hundred eighty-nine thousand, eight hundred ninety-one".